/*!
    \file  sdcard.c
    \brief SD card driver 
*/

/*
    Copyright (C) 2017 GigaDevice

    2015-07-15, V1.0.0, firmware for GD32F20x
    2017-06-05, V2.0.0, firmware for GD32F20x
*/

#include "sdcard.h"
#include "gd32f30x_sdio.h"
#include <stddef.h>

/* card status of R1 definitions */
#define SD_R1_OUT_OF_RANGE                  BIT(31)                   /* command's argument was out of the allowed range */
#define SD_R1_ADDRESS_ERROR                 BIT(30)                   /* misaligned address which did not match the block length */
#define SD_R1_BLOCK_LEN_ERROR               BIT(29)                   /* transferred block length is not allowed */
#define SD_R1_ERASE_SEQ_ERROR               BIT(28)                   /* an error in the sequence of erase commands occurred */
#define SD_R1_ERASE_PARAM                   BIT(27)                   /* an invalid selection of write-blocks for erase occurred */
#define SD_R1_WP_VIOLATION                  BIT(26)                   /* the host attempts to write to a protected block or to the temporary or permanent write protected card */
#define SD_R1_CARD_IS_LOCKED                BIT(25)                   /* the card is locked by the host */
#define SD_R1_LOCK_UNLOCK_FAILED            BIT(24)                   /* a sequence or password error has been detected in lock/unlock card command */
#define SD_R1_COM_CRC_ERROR                 BIT(23)                   /* CRC check of the previous command failed */
#define SD_R1_ILLEGAL_COMMAND               BIT(22)                   /* command not legal for the card state */
#define SD_R1_CARD_ECC_FAILED               BIT(21)                   /* card internal ECC was applied but failed to correct the data */
#define SD_R1_CC_ERROR                      BIT(20)                   /* internal card controller error */
#define SD_R1_GENERAL_UNKNOWN_ERROR         BIT(19)                   /* a general or an unknown error occurred during the operation */
#define SD_R1_CSD_OVERWRITE                 BIT(16)                   /* read only section of the CSD does not match or attempt to reverse the copy or permanent WP bits */
#define SD_R1_WP_ERASE_SKIP                 BIT(15)                   /* partial address space was erased */
#define SD_R1_CARD_ECC_DISABLED             BIT(14)                   /* command has been executed without using the internal ECC */
#define SD_R1_ERASE_RESET                   BIT(13)                   /* an erase sequence was cleared before executing */
#define SD_R1_READY_FOR_DATA                BIT(8)                    /* correspond to buffer empty signaling on the bus */
#define SD_R1_APP_CMD                       BIT(5)                    /* card will expect ACMD */
#define SD_R1_AKE_SEQ_ERROR                 BIT(3)                    /* error in the sequence of the authentication process */
#define SD_R1_ERROR_BITS                    (uint32_t)0xFDF9E008      /* all the R1 error bits */

/* card status of R6 definitions */
#define SD_R6_COM_CRC_ERROR                 BIT(15)                   /* CRC check of the previous command failed */
#define SD_R6_ILLEGAL_COMMAND               BIT(14)                   /* command not legal for the card state */
#define SD_R6_GENERAL_UNKNOWN_ERROR         BIT(13)                   /* a general or an unknown error occurred during the operation */

/* card state */
#define SD_CARDSTATE_IDLE                   ((uint8_t)0x00)           /* card is in idle state */
#define SD_CARDSTATE_READY                  ((uint8_t)0x01)           /* card is in ready state */
#define SD_CARDSTATE_IDENTIFICAT            ((uint8_t)0x02)           /* card is in identificat state */
#define SD_CARDSTATE_STANDBY                ((uint8_t)0x03)           /* card is in standby state */
#define SD_CARDSTATE_TRANSFER               ((uint8_t)0x04)           /* card is in transfer state */
#define SD_CARDSTATE_DATA                   ((uint8_t)0x05)           /* card is in data sending state */
#define SD_CARDSTATE_RECEIVING              ((uint8_t)0x06)           /* card is in receiving state */
#define SD_CARDSTATE_PROGRAMMING            ((uint8_t)0x07)           /* card is in programming state */
#define SD_CARDSTATE_DISCONNECT             ((uint8_t)0x08)           /* card is in disconnect state */
#define SD_CARDSTATE_LOCKED                 ((uint32_t)0x02000000)    /* card is in locked state */

#define SD_CHECK_PATTERN                    ((uint32_t)0x000001AA)    /* check pattern for CMD8 */
#define SD_VOLTAGE_WINDOW                   ((uint32_t)0x80100000)    /* host 3.3V request in ACMD41 */

/* parameters for ACMD41(voltage validation) */
#define SD_HIGH_CAPACITY                    ((uint32_t)0x40000000)    /* high capacity SD memory card */
#define SD_STD_CAPACITY                     ((uint32_t)0x00000000)    /* standard capacity SD memory card */

/* SD bus width, check SCR register */
#define SD_BUS_WIDTH_4BIT                   ((uint32_t)0x00040000)    /* 4-bit width bus mode */
#define SD_BUS_WIDTH_1BIT                   ((uint32_t)0x00010000)    /* 1-bit width bus mode */

/* masks for SCR register */
#define SD_MASK_0_7BITS                     ((uint32_t)0x000000FF)    /* mask [7:0] bits */
#define SD_MASK_8_15BITS                    ((uint32_t)0x0000FF00)    /* mask [15:8] bits */
#define SD_MASK_16_23BITS                   ((uint32_t)0x00FF0000)    /* mask [23:16] bits */
#define SD_MASK_24_31BITS                   ((uint32_t)0xFF000000)    /* mask [31:24] bits */

#define SDIO_FIFO_ADDR                      ((uint32_t)SDIO + 0x80U)  /* address of SDIO_FIFO */
#define SD_FIFOHALF_WORDS                   ((uint32_t)0x00000008)    /* words of FIFO half full/empty */
#define SD_FIFOHALF_BYTES                   ((uint32_t)0x00000020)    /* bytes of FIFO half full/empty */

#define SD_DATATIMEOUT                      ((uint32_t)0xFFFFFFFF)    /* DSM data timeout */
#define SD_MAX_VOLT_VALIDATION              ((uint32_t)0x0000FFFF)    /* the maximum times of voltage validation */
#define SD_MAX_DATA_LENGTH                  ((uint32_t)0x01FFFFFF)    /* the maximum length of data */
#define SD_ALLZERO                          ((uint32_t)0x00000000)    /* all zero */
#define SD_RCA_SHIFT                        ((uint8_t)0x10)           /* RCA shift bits */
#define SD_CLK_DIV_INIT                     ((uint16_t)0x0076)        /* SD clock division in initilization phase */
#define SD_CLK_DIV_TRANS                    ((uint16_t)0x0002)        /* SD clock division in transmission phase */

#define SDIO_MASK_INTC_FLAGS                ((uint32_t)0x00C007FF)    /* mask flags of SDIO_INTC */

uint32_t sd_scr[2] = {0,0};                                           /* content of SCR register */

static sdio_card_type_enum cardtype = SDIO_STD_CAPACITY_SD_CARD_V1_1; /* SD card type */
static uint32_t sd_csd[4] = {0,0,0,0};                                /* content of CSD register */
static uint32_t sd_cid[4] = {0,0,0,0};                                /* content of CID register */
static uint16_t sd_rca = 0;                                           /* RCA of SD card */
static uint32_t transmode = SD_POLLING_MODE;
static uint32_t totalnumber_bytes = 0, stopcondition = 0;
static __IO sd_error_enum transerror = SD_OK;
static __IO uint32_t transend = 0, number_bytes = 0;

/* check if the command sent error occurs */
static sd_error_enum cmdsent_error_check(void);
/* check if error occurs for R1 response */
static sd_error_enum r1_error_check(uint8_t cmdindex);
/* check if error type for R1 response */
static sd_error_enum r1_error_type_check(uint32_t resp);
/* check if error occurs for R2 response */
static sd_error_enum r2_error_check(void);
/* check if error occurs for R3 response */
static sd_error_enum r3_error_check(void);
/* check if error occurs for R6 response */
static sd_error_enum r6_error_check(uint8_t cmdindex, uint16_t *prca);
/* check if error occurs for R7 response */
static sd_error_enum r7_error_check(void);

/* get the state which the card is in */
static sd_error_enum sd_card_state_get(uint8_t *pcardstate);
/* configure the bus width mode */
static sd_error_enum sd_bus_width_config(uint32_t buswidth);
/* get the SCR of corresponding card */
static sd_error_enum sd_scr_get(uint16_t rca, uint32_t *pscr);
/* get the data block size */
static uint32_t sd_datablocksize_get(uint16_t bytesnumber);

/* configure the GPIO of SDIO interface */
static void gpio_config(void);
/* configure the RCU of SDIO and DMA */
static void rcu_config(void);
/* configure the DMA for SDIO transfer request */
static void dma_transfer_config(uint32_t *srcbuf, uint32_t bufsize);
/* configure the DMA for SDIO reveive request */
static void dma_receive_config(uint32_t *dstbuf, uint32_t bufsize);

/*!
    \brief      initialize the SD card and make it in standby state
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_init(void)
{
    sd_error_enum status = SD_OK;
    /* configure the RCU and GPIO, deinitialize the SDIO */
    rcu_config();
    gpio_config();
    sdio_deinit();
    
    /* configure the clock and work voltage */
    status = sd_power_on();
    if(SD_OK != status){
        return status;
    }
    
    /* initialize the card and get CID and CSD of the card */
    status = sd_card_init();
    if(SD_OK != status){
        return status;
    }
    
    /* configure the SDIO peripheral */
    sdio_clock_config(SDIO_SDIOCLKEDGE_RISING, SDIO_CLOCKBYPASS_DISABLE, SDIO_CLOCKPWRSAVE_DISABLE, SD_CLK_DIV_TRANS);
    sdio_bus_mode_set(SDIO_BUSMODE_1BIT);
    sdio_hardware_clock_disable();
    
    return status;
}

/*!
    \brief      initialize the card and get CID and CSD of the card
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_card_init(void)
{
    sd_error_enum status = SD_OK;
    uint16_t temp_rca = 0x01;
    
    if(SDIO_POWER_OFF == sdio_power_state_get()){
        status = SD_OPERATION_IMPROPER;
        return status;
    }
    
    /* the card is not I/O only card */
    if(SDIO_SECURE_DIGITAL_IO_CARD != cardtype){
        /* send CMD2(SD_CMD_ALL_SEND_CID) to get the CID numbers */
        sdio_command_response_config(SD_CMD_ALL_SEND_CID, (uint32_t)0x0, SDIO_RESPONSETYPE_LONG);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r2_error_check();
        if(SD_OK != status){
            return status;
        }
        
        /* store the CID numbers */
        sd_cid[0] = sdio_response_get(SDIO_RESPONSE0);
        sd_cid[1] = sdio_response_get(SDIO_RESPONSE1);
        sd_cid[2] = sdio_response_get(SDIO_RESPONSE2);
        sd_cid[3] = sdio_response_get(SDIO_RESPONSE3);
    }
    
    /* the card is SD memory card or the I/O card has the memory portion */
    if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype) || 
        (SDIO_HIGH_CAPACITY_SD_CARD == cardtype) || (SDIO_SECURE_DIGITAL_IO_COMBO_CARD == cardtype)){
        /* send CMD3(SEND_RELATIVE_ADDR) to ask the card to publish a new relative address (RCA) */
        sdio_command_response_config(SD_CMD_SEND_RELATIVE_ADDR, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r6_error_check(SD_CMD_SEND_RELATIVE_ADDR, &temp_rca);
        if(SD_OK != status){
            return status;
        }
    }
    
    if(SDIO_SECURE_DIGITAL_IO_CARD != cardtype){
        /* the card is not I/O only card */
        sd_rca = temp_rca;
        
        /* send CMD9(SEND_CSD) to get the addressed card's card-specific data (CSD) */
        sdio_command_response_config(SD_CMD_SEND_CSD, (uint32_t)(temp_rca << SD_RCA_SHIFT), SDIO_RESPONSETYPE_LONG);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r2_error_check();
        if(SD_OK != status){
            return status;
        }
        
        /* store the card-specific data (CSD) */
        sd_csd[0] = sdio_response_get(SDIO_RESPONSE0);
        sd_csd[1] = sdio_response_get(SDIO_RESPONSE1);
        sd_csd[2] = sdio_response_get(SDIO_RESPONSE2);
        sd_csd[3] = sdio_response_get(SDIO_RESPONSE3);
    }
    return status;
}

/*!
    \brief      configure the clock and the work voltage, and get the card type
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_power_on(void)
{
    sd_error_enum status = SD_OK;
    uint32_t sdcardtype = SD_STD_CAPACITY, response = 0, count = 0;
    uint8_t busyflag = 0;
    
    /* configure the SDIO peripheral */
    sdio_clock_config(SDIO_SDIOCLKEDGE_RISING, SDIO_CLOCKBYPASS_DISABLE, SDIO_CLOCKPWRSAVE_DISABLE, SD_CLK_DIV_INIT);
    sdio_bus_mode_set(SDIO_BUSMODE_1BIT);
    sdio_hardware_clock_disable();
    sdio_power_state_set(SDIO_POWER_ON);
    /* enable SDIO_CLK clock output */
    sdio_clock_enable();
    
    /* send CMD0(GO_IDLE_STATE) to reset the card */
    sdio_command_response_config(SD_CMD_GO_IDLE_STATE, (uint32_t)0x0, SDIO_RESPONSETYPE_NO);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    /* enable the CSM */
    sdio_csm_enable();
    
    /* check if command sent error occurs */
    status = cmdsent_error_check();
    if(SD_OK != status){
        return status;
    }
    
    /* send CMD8(SEND_IF_COND) to get SD memory card interface condition */
    sdio_command_response_config(SD_CMD_SEND_IF_COND, SD_CHECK_PATTERN, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    
    if(SD_OK == r7_error_check()){
        /* SD Card 2.0 */
        cardtype = SDIO_STD_CAPACITY_SD_CARD_V2_0;
        sdcardtype = SD_HIGH_CAPACITY;
    }
    
    /* send CMD55(APP_CMD) to indicate next command is application specific command */
    sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    
    if(SD_OK == r1_error_check(SD_CMD_APP_CMD)){
        /* SD memory card */
        while((!busyflag) && (count < SD_MAX_VOLT_VALIDATION)){
            /* send CMD55(APP_CMD) to indicate next command is application specific command */
            sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_CMD_APP_CMD);
            if(SD_OK != status){
                return status;
            }
            
            /* send ACMD41(SD_SEND_OP_COND) to get host capacity support information (HCS) and OCR content */
            sdio_command_response_config(SD_APPCMD_SD_SEND_OP_COND, (SD_VOLTAGE_WINDOW | sdcardtype), SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r3_error_check();
            if(SD_OK != status){
                return status;
            }
            /* get the response and check card power up status bit(busy) */
            response = sdio_response_get(SDIO_RESPONSE0);
            busyflag = (uint8_t)((response >> 31)&(uint32_t)0x01);
            ++count;
        }
        if(count >= SD_MAX_VOLT_VALIDATION){
            status = SD_VOLTRANGE_INVALID;
            return status;
        }
        if(response &= SD_HIGH_CAPACITY){
            /* SDHC card */
            cardtype = SDIO_HIGH_CAPACITY_SD_CARD;
        }
    }
    return status;
}

/*!
    \brief      close the power of SDIO
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_power_off(void)
{
    sd_error_enum status = SD_OK;
    sdio_power_state_set(SDIO_POWER_OFF);
    return status;
}

/*!
    \brief      configure the bus mode
    \param[in]  busmode: the bus mode
      \arg        SDIO_BUSMODE_1BIT: 1-bit SDIO card bus mode
      \arg        SDIO_BUSMODE_4BIT: 4-bit SDIO card bus mode
      \arg        SDIO_BUSMODE_8BIT: 8-bit SDIO card bus mode (MMC only)
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_bus_mode_config(uint32_t busmode)
{
    sd_error_enum status = SD_OK;
    if(SDIO_MULTIMEDIA_CARD == cardtype){
        /* MMC card doesn't support this function */
        status = SD_FUNCTION_UNSUPPORTED;
        return status;
    }else if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype) || 
             (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)){
        if(SDIO_BUSMODE_8BIT == busmode){
            /* 8 bit bus mode doesn't support */
            status = SD_FUNCTION_UNSUPPORTED;
            return status;
        }else if(SDIO_BUSMODE_4BIT == busmode){
            /* configure SD bus width and the SDIO */
            status = sd_bus_width_config(SD_BUS_WIDTH_4BIT);
            if(SD_OK == status){
                sdio_clock_config(SDIO_SDIOCLKEDGE_RISING, SDIO_CLOCKBYPASS_DISABLE,
                                    SDIO_CLOCKPWRSAVE_DISABLE, SD_CLK_DIV_TRANS);
                sdio_bus_mode_set(busmode);
                sdio_hardware_clock_disable();
            }
        }else if(SDIO_BUSMODE_1BIT == busmode){
            /* configure SD bus width and the SDIO */
            status = sd_bus_width_config(SD_BUS_WIDTH_1BIT);
            if(SD_OK == status){
                sdio_clock_config(SDIO_SDIOCLKEDGE_RISING, SDIO_CLOCKBYPASS_DISABLE, 
                                    SDIO_CLOCKPWRSAVE_DISABLE, SD_CLK_DIV_TRANS);
                sdio_bus_mode_set(busmode);
                sdio_hardware_clock_disable();
            }
        }else{
            status = SD_PARAMETER_INVALID;
        }
    }
    return status;
}

/*!
    \brief      configure the mode of transmission
    \param[in]  txmode: transfer mode
      \arg        SD_DMA_MODE: DMA mode
      \arg        SD_POLLING_MODE: polling mode
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_transfer_mode_config(uint32_t txmode)
{
    sd_error_enum status = SD_OK;
    /* set the transfer mode */
    if((SD_DMA_MODE == txmode) || (SD_POLLING_MODE == txmode)){
        transmode = txmode;
    }else{
        status = SD_PARAMETER_INVALID;
    }
    return status;
}

/*!
    \brief      read a block data into a buffer from the specified address of a card
    \param[out] preadbuffer: a pointer that store a block read data
    \param[in]  readaddr: the read data address
    \param[in]  blocksize: the data block size
    \retval     sd_error_enum
*/
sd_error_enum sd_block_read(uint32_t *preadbuffer, uint32_t readaddr, uint16_t blocksize)
{
    /* initialize the variables */
    sd_error_enum status = SD_OK;
    uint32_t count = 0, align = 0, datablksize = SDIO_DATABLOCKSIZE_1BYTE, *ptempbuff = preadbuffer;
    uint32_t timeout = 0;
    if(NULL == preadbuffer){
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    transerror = SD_OK;
    transend = 0;
    totalnumber_bytes = 0;
    /* clear all DSM configuration */
    sdio_data_config(0, 0, SDIO_DATABLOCKSIZE_1BYTE);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_disable();
    sdio_dma_disable();
    
    /* check whether the card is locked */
    if(sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED){
        status = SD_LOCK_UNLOCK_FAILED;
        return status;
    }
    
    /* blocksize is fixed in 512B for SDHC card */
    if (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)
    {
        blocksize = 512;
        readaddr /= 512;
    }
    
    align = blocksize & (blocksize - 1);
    if((blocksize > 0) && (blocksize <= 2048) && (0 == align)){
        datablksize = sd_datablocksize_get(blocksize);
        /* send CMD16(SET_BLOCKLEN) to set the block length */
        sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)blocksize, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_SET_BLOCKLEN);
        if(SD_OK != status){
            return status;
        }
    }else{
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    stopcondition = 0;
    totalnumber_bytes = blocksize;
    
    /* configure SDIO data transmisson */
    sdio_data_config(SD_DATATIMEOUT, totalnumber_bytes, datablksize);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOSDIO, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_enable();
    
    /* send CMD17(READ_SINGLE_BLOCK) to read a block */
    sdio_command_response_config(SD_CMD_READ_SINGLE_BLOCK, (uint32_t)readaddr, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_READ_SINGLE_BLOCK);
    if(SD_OK != status){
        return status;
    }
    
    if(SD_POLLING_MODE == transmode){
        /* polling mode */
        while(!sdio_flag_get(SDIO_FLAG_DTCRCERR | SDIO_FLAG_DTTMOUT | SDIO_FLAG_RXORE | SDIO_FLAG_DTBLKEND | SDIO_FLAG_STBITE)){
            if(RESET != sdio_flag_get(SDIO_FLAG_RFH)){
                /* at least 8 words can be read in the FIFO */
                for(count = 0; count < SD_FIFOHALF_WORDS; count++){
                    *(ptempbuff + count) = sdio_data_read();
                }
                ptempbuff += SD_FIFOHALF_WORDS;
            }
        }
        
        /* whether some error occurs and return it */
        if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
            status = SD_DATA_CRC_ERROR;
            sdio_flag_clear(SDIO_FLAG_DTCRCERR);
            return status;
        }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
            status = SD_DATA_TIMEOUT;
            sdio_flag_clear(SDIO_FLAG_DTTMOUT);
            return status;
        }else if(RESET != sdio_flag_get(SDIO_FLAG_RXORE)){
            status = SD_RX_OVERRUN_ERROR;
            sdio_flag_clear(SDIO_FLAG_RXORE);
            return status;
        }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
            status = SD_START_BIT_ERROR;
            sdio_flag_clear(SDIO_FLAG_STBITE);
            return status;
        }
        while(RESET != sdio_flag_get(SDIO_FLAG_RXDTVAL)){
            *ptempbuff = sdio_data_read();
            ++ptempbuff;
        }
        /* clear the SDIO_INTC flags */
        sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    }else if(SD_DMA_MODE == transmode){
        /* DMA mode */
        /* enable the SDIO corresponding interrupts and DMA function */
        sdio_interrupt_enable(SDIO_INT_CCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_RXORE | SDIO_INT_DTEND | SDIO_INT_STBITE);
        sdio_dma_enable();
        dma_receive_config(preadbuffer, blocksize);
        timeout = 10000;
        while((RESET == dma_flag_get(DMA1, DMA_CH3, DMA_FLAG_FTF)) && (timeout > 0)){
            timeout--;
            if(0 == timeout){
                return SD_ERROR;
            }
        }
    }else{
        status = SD_PARAMETER_INVALID;
    }
    return status;
}

/*!
    \brief      read multiple blocks data into a buffer from the specified address of a card
    \param[out] preadbuffer: a pointer that store multiple blocks read data
    \param[in]  readaddr: the read data address
    \param[in]  blocksize: the data block size
    \param[in]  blocksnumber: number of blocks that will be read
    \retval     sd_error_enum
*/
sd_error_enum sd_multiblocks_read(uint32_t *preadbuffer, uint32_t readaddr, uint16_t blocksize, uint32_t blocksnumber)
{
    /* initialize the variables */
    sd_error_enum status = SD_OK;
    uint32_t count = 0, align = 0, datablksize = SDIO_DATABLOCKSIZE_1BYTE, *ptempbuff = preadbuffer;
    uint32_t timeout = 0;
    if(NULL == preadbuffer){
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    transerror = SD_OK;
    transend = 0;
    totalnumber_bytes = 0;
    /* clear all DSM configuration */
    sdio_data_config(0, 0, SDIO_DATABLOCKSIZE_1BYTE);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_disable();
    sdio_dma_disable();
    
    /* check whether the card is locked */
    if(sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED){
        status = SD_LOCK_UNLOCK_FAILED;
        return status;
    }
    
    /* blocksize is fixed in 512B for SDHC card */
    if (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)
    {
        blocksize = 512;
        readaddr /= 512;
    }
    
    align = blocksize & (blocksize - 1);
    if((blocksize > 0) && (blocksize <= 2048) && (0 == align)){
        datablksize = sd_datablocksize_get(blocksize);
        /* send CMD16(SET_BLOCKLEN) to set the block length */
        sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)blocksize, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_SET_BLOCKLEN);
        if(SD_OK != status){
            return status;
        }
    }else{
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    if(blocksnumber >= 1){
        if(blocksnumber * blocksize > SD_MAX_DATA_LENGTH){
            /* exceeds the maximum length */
            status = SD_PARAMETER_INVALID;
            return status;
        }
        
        stopcondition = 1;
        totalnumber_bytes = blocksnumber * blocksize;
        
        /* configure the SDIO data transmisson */
        sdio_data_config(SD_DATATIMEOUT, totalnumber_bytes, datablksize);
        sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOSDIO, SDIO_TRANSMODE_BLOCK);
        sdio_dsm_enable();
        
        /* send CMD18(READ_MULTIPLE_BLOCK) to read multiple blocks */
        sdio_command_response_config(SD_CMD_READ_MULTIPLE_BLOCK, readaddr, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_READ_MULTIPLE_BLOCK);
        if(SD_OK != status){
            return status;
        }
        
        if(SD_POLLING_MODE == transmode){
            /* polling mode */
            while(!sdio_flag_get(SDIO_FLAG_DTCRCERR | SDIO_FLAG_DTTMOUT | SDIO_FLAG_RXORE | SDIO_FLAG_DTEND | SDIO_FLAG_STBITE)){
                if(RESET != sdio_flag_get(SDIO_FLAG_RFH)){
                    /* at least 8 words can be read in the FIFO */
                    for(count = 0; count < SD_FIFOHALF_WORDS; count++){
                        *(ptempbuff + count) = sdio_data_read();
                    }
                    ptempbuff += SD_FIFOHALF_WORDS;
                }
            }
            
            /* whether some error occurs and return it */
            if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
                status = SD_DATA_CRC_ERROR;
                sdio_flag_clear(SDIO_FLAG_DTCRCERR);
                return status;
            }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
                status = SD_DATA_TIMEOUT;
                sdio_flag_clear(SDIO_FLAG_DTTMOUT);
                return status;
            }else if(RESET != sdio_flag_get(SDIO_FLAG_RXORE)){
                status = SD_RX_OVERRUN_ERROR;
                sdio_flag_clear(SDIO_FLAG_RXORE);
                return status;
            }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
                status = SD_START_BIT_ERROR;
                sdio_flag_clear(SDIO_FLAG_STBITE);
                return status;
            }
            while(RESET != sdio_flag_get(SDIO_FLAG_RXDTVAL)){
                *ptempbuff = sdio_data_read();
                ++ptempbuff;
            }
            
            if(RESET != sdio_flag_get(SDIO_FLAG_DTEND)){
                if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype) || 
                    (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)){
                    /* send CMD12(STOP_TRANSMISSION) to stop transmission */
                    sdio_command_response_config(SD_CMD_STOP_TRANSMISSION, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
                    sdio_wait_type_set(SDIO_WAITTYPE_NO);
                    sdio_csm_enable();
                    /* check if some error occurs */
                    status = r1_error_check(SD_CMD_STOP_TRANSMISSION);
                    if(SD_OK != status){
                        return status;
                    }
                }
            }
            sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
        }else if(SD_DMA_MODE == transmode){
            /* DMA mode */
            /* enable the SDIO corresponding interrupts and DMA function */
            sdio_interrupt_enable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_RXORE | SDIO_INT_DTEND | SDIO_INT_STBITE);
            sdio_dma_enable();
            dma_receive_config(preadbuffer, totalnumber_bytes);
            timeout = 10000;
            while((RESET == dma_flag_get(DMA1, DMA_CH3, DMA_FLAG_FTF)) && (timeout > 0)){
                timeout--;
                if(0 == timeout){
                    return SD_ERROR;
                }
            }
            while((0 == transend) && (SD_OK == transerror)){
            }
            if(SD_OK != transerror){
                return transerror;
            }
        }else{
            status = SD_PARAMETER_INVALID;
        }
    }
    return status;
}

/*!
    \brief      write a block data to the specified address of a card
    \param[in]  pwritebuffer: a pointer that store a block data to be transferred
    \param[in]  writeaddr: the read data address
    \param[in]  blocksize: the data block size
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_block_write(uint32_t *pwritebuffer, uint32_t writeaddr, uint16_t blocksize)
{
    /* initialize the variables */
    sd_error_enum status = SD_OK;
    uint8_t cardstate = 0;
    uint32_t count = 0, align = 0, datablksize = SDIO_DATABLOCKSIZE_1BYTE, *ptempbuff = pwritebuffer;
    uint32_t timeout = 0, transbytes = 0, restwords = 0, response = 0;
    
    if(NULL == pwritebuffer){
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    transerror = SD_OK;
    transend = 0;
    totalnumber_bytes = 0;
    /* clear all DSM configuration */
    sdio_data_config(0, 0, SDIO_DATABLOCKSIZE_1BYTE);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_disable();
    sdio_dma_disable();
    
    /* check whether the card is locked */
    if(sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED){
        status = SD_LOCK_UNLOCK_FAILED;
        return status;
    }
    
    /* blocksize is fixed in 512B for SDHC card */
    if (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)
    {
        blocksize = 512;
        writeaddr /= 512;
    }
    
    align = blocksize & (blocksize - 1);
    if((blocksize > 0) && (blocksize <= 2048) && (0 == align)){
        datablksize = sd_datablocksize_get(blocksize);
        /* send CMD16(SET_BLOCKLEN) to set the block length */
        sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)blocksize, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_SET_BLOCKLEN);
        if(SD_OK != status){
            return status;
        }
    }else{
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    /* send CMD13(SEND_STATUS), addressed card sends its status registers */
    sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SEND_STATUS);
    if(SD_OK != status){
        return status;
    }
    
    response = sdio_response_get(SDIO_RESPONSE0);
    timeout = 10000;
    
    while((0 == (response & SD_R1_READY_FOR_DATA)) && (timeout > 0)){
        /* continue to send CMD13 to polling the state of card until buffer empty or timeout */
        --timeout;
        /* send CMD13(SEND_STATUS), addressed card sends its status registers */
        sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_SEND_STATUS);
        if(SD_OK != status){
            return status;
        }
        response = sdio_response_get(SDIO_RESPONSE0);
    }
    if(0 == timeout){
        return SD_ERROR;
    }
    
    /* send CMD24(WRITE_BLOCK) to write a block */
    sdio_command_response_config(SD_CMD_WRITE_BLOCK, writeaddr, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_WRITE_BLOCK);
    if(SD_OK != status){
        return status;
    }
    
    stopcondition = 0;
    totalnumber_bytes = blocksize;
    
    /* configure the SDIO data transmisson */
    sdio_data_config(SD_DATATIMEOUT, totalnumber_bytes, datablksize);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_enable();
    
    if(SD_POLLING_MODE == transmode){
        /* polling mode */
        while(!sdio_flag_get(SDIO_FLAG_DTCRCERR | SDIO_FLAG_DTTMOUT | SDIO_FLAG_TXURE | SDIO_FLAG_DTBLKEND | SDIO_FLAG_STBITE)){
            if(RESET != sdio_flag_get(SDIO_FLAG_TFH)){
                /* at least 8 words can be written into the FIFO */
                if((totalnumber_bytes - transbytes) < SD_FIFOHALF_BYTES){
                    restwords = (totalnumber_bytes - transbytes)/4 + (((totalnumber_bytes - transbytes)%4 == 0) ? 0 : 1);
                    for(count = 0; count < restwords; count++){
                        sdio_data_write(*ptempbuff);
                        ++ptempbuff;
                        transbytes += 4;
                    }
                }else{
                    for(count = 0; count < SD_FIFOHALF_WORDS; count++){
                        sdio_data_write(*(ptempbuff + count));
                    }
                    /* 8 words(32 bytes) has been transferred */
                    ptempbuff += SD_FIFOHALF_WORDS;
                    transbytes += SD_FIFOHALF_BYTES;
                }
            }
        }
        
        /* whether some error occurs and return it */
        if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
            status = SD_DATA_CRC_ERROR;
            sdio_flag_clear(SDIO_FLAG_DTCRCERR);
            return status;
        }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
            status = SD_DATA_TIMEOUT;
            sdio_flag_clear(SDIO_FLAG_DTTMOUT);
            return status;
        }else if(RESET != sdio_flag_get(SDIO_FLAG_TXURE)){
            status = SD_TX_UNDERRUN_ERROR;
            sdio_flag_clear(SDIO_FLAG_TXURE);
            return status;
        }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
            status = SD_START_BIT_ERROR;
            sdio_flag_clear(SDIO_FLAG_STBITE);
            return status;
        }
    }else if(SD_DMA_MODE == transmode){
        /* DMA mode */
        /* enable the SDIO corresponding interrupts and DMA */
        sdio_interrupt_enable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_TXURE | SDIO_INT_DTEND | SDIO_INT_STBITE);
        dma_transfer_config(pwritebuffer, blocksize);
        sdio_dma_enable();
        timeout = 10000;
        while((RESET == dma_flag_get(DMA1, DMA_CH3, DMA_FLAG_FTF)) && (timeout > 0)){
            timeout--;
            if(0 == timeout){
                return SD_ERROR;
            }
        }
        while ((0 == transend) && (SD_OK == transerror)){
        }

        if (SD_OK != transerror){
            return transerror;
        }
    }else{
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    /* clear the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* get the card state and wait the card is out of programming and receiving state */
    status = sd_card_state_get(&cardstate);
    while((SD_OK == status) && ((SD_CARDSTATE_PROGRAMMING == cardstate) || (SD_CARDSTATE_RECEIVING == cardstate))){
        status = sd_card_state_get(&cardstate);
    }
    return status;
}

/*!
    \brief      write multiple blocks data to the specified address of a card
    \param[in]  pwritebuffer: a pointer that store multiple blocks data to be transferred
    \param[in]  writeaddr: the read data address
    \param[in]  blocksize: the data block size
    \param[in]  blocksnumber: number of blocks that will be written
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_multiblocks_write(uint32_t *pwritebuffer, uint32_t writeaddr, uint16_t blocksize, uint32_t blocksnumber)
{
    /* initialize the variables */
    sd_error_enum status = SD_OK;
    uint8_t cardstate = 0;
    uint32_t count = 0, align = 0, datablksize = SDIO_DATABLOCKSIZE_1BYTE, *ptempbuff = pwritebuffer;
    uint32_t transbytes = 0, restwords = 0;
    uint32_t timeout = 0;    
    if(NULL == pwritebuffer){
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    transerror = SD_OK;
    transend = 0;
    totalnumber_bytes = 0;
    /* clear all DSM configuration */
    sdio_data_config(0, 0, SDIO_DATABLOCKSIZE_1BYTE);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_disable();
    sdio_dma_disable();
    
    /* check whether the card is locked */
    if(sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED){
        status = SD_LOCK_UNLOCK_FAILED;
        return status;
    }
    
    /* blocksize is fixed in 512B for SDHC card */
    if (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)
    {
        blocksize = 512;
        writeaddr /= 512;
    }
    
    align = blocksize & (blocksize - 1);
    if((blocksize > 0) && (blocksize <= 2048) && (0 == align)){
        datablksize = sd_datablocksize_get(blocksize);
        /* send CMD16(SET_BLOCKLEN) to set the block length */
        sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)blocksize, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_SET_BLOCKLEN);
        if(SD_OK != status){
            return status;
        }
    }else{
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    /* send CMD13(SEND_STATUS), addressed card sends its status registers */
    sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SEND_STATUS);
    if(SD_OK != status){
        return status;
    }
    
    if(blocksnumber >= 1){
        if(blocksnumber * blocksize > SD_MAX_DATA_LENGTH){
            status = SD_PARAMETER_INVALID;
            return status;
        }
        
        if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype) || 
            (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)){
            /* send CMD55(APP_CMD) to indicate next command is application specific command */
            sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_CMD_APP_CMD);
            if(SD_OK != status){
                return status;
            }
            
            /* send ACMD23(SET_WR_BLK_ERASE_COUNT) to set the number of write blocks to be preerased before writing */
            sdio_command_response_config(SD_APPCMD_SET_WR_BLK_ERASE_COUNT, blocksnumber, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_APPCMD_SET_WR_BLK_ERASE_COUNT);
            if(SD_OK != status){
                return status;
            }
        }
        /* send CMD25(WRITE_MULTIPLE_BLOCK) to continuously write blocks of data */
        sdio_command_response_config(SD_CMD_WRITE_MULTIPLE_BLOCK, writeaddr, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_WRITE_MULTIPLE_BLOCK);
        if(SD_OK != status){
            return status;
        }
        
        stopcondition = 1;
        totalnumber_bytes = blocksnumber * blocksize;
        
        /* configure the SDIO data transmisson */
        sdio_data_config(SD_DATATIMEOUT, totalnumber_bytes, datablksize);
        sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
        sdio_dsm_enable();
        
        if(SD_POLLING_MODE == transmode){
            /* polling mode */
            while(!sdio_flag_get(SDIO_FLAG_DTCRCERR | SDIO_FLAG_DTTMOUT | SDIO_FLAG_TXURE | SDIO_FLAG_DTEND | SDIO_FLAG_STBITE)){
                if(RESET != sdio_flag_get(SDIO_FLAG_TFH)){
                    /* at least 8 words can be written into the FIFO */
                    if(!((totalnumber_bytes - transbytes) < SD_FIFOHALF_BYTES)){
                        for(count = 0; count < SD_FIFOHALF_WORDS; count++){
                            sdio_data_write(*(ptempbuff + count));
                        }
                        /* 8 words(32 bytes) has been transferred */
                        ptempbuff += SD_FIFOHALF_WORDS;
                        transbytes += SD_FIFOHALF_BYTES;
                    }else{
                        restwords = (totalnumber_bytes - transbytes)/4 + (((totalnumber_bytes - transbytes)%4 == 0) ? 0 : 1);
                        for(count = 0; count < restwords; count++){
                            sdio_data_write(*ptempbuff);
                            ++ptempbuff;
                            transbytes += 4;
                        }
                    }
                }
            }
            
            /* whether some error occurs and return it */
            if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
                status = SD_DATA_CRC_ERROR;
                sdio_flag_clear(SDIO_FLAG_DTCRCERR);
                return status;
            }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
                status = SD_DATA_TIMEOUT;
                sdio_flag_clear(SDIO_FLAG_DTTMOUT);
                return status;
            }else if(RESET != sdio_flag_get(SDIO_FLAG_TXURE)){
                status = SD_TX_UNDERRUN_ERROR;
                sdio_flag_clear(SDIO_FLAG_TXURE);
                return status;
            }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
                status = SD_START_BIT_ERROR;
                sdio_flag_clear(SDIO_FLAG_STBITE);
                return status;
            }
            
            if(RESET != sdio_flag_get(SDIO_FLAG_DTEND)){
                if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype) || 
                    (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)){
                    /* send CMD12(STOP_TRANSMISSION) to stop transmission */
                    sdio_command_response_config(SD_CMD_STOP_TRANSMISSION, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
                    sdio_wait_type_set(SDIO_WAITTYPE_NO);
                    sdio_csm_enable();
                    /* check if some error occurs */
                    status = r1_error_check(SD_CMD_STOP_TRANSMISSION);
                    if(SD_OK != status){
                        return status;
                    }
                }
            }
            sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
        }else if(SD_DMA_MODE == transmode){
            /* DMA mode */
            /* enable SDIO corresponding interrupts and DMA */
            sdio_interrupt_enable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_TXURE | SDIO_INT_DTEND | SDIO_INT_STBITE);
            sdio_dma_enable();
            dma_transfer_config(pwritebuffer, totalnumber_bytes);
            timeout = 10000;
            while((RESET == dma_flag_get(DMA1, DMA_CH3, DMA_FLAG_FTF) && (timeout > 0))){
                timeout--;
                if(0 == timeout){
                    return SD_ERROR;
                }
            }
            while((0 == transend) && (SD_OK == transerror)){
            }
            if(SD_OK != transerror){
                return transerror;
            }
        }else{
            status = SD_PARAMETER_INVALID;
            return status;
        }
    }
    
    /* clear the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* get the card state and wait the card is out of programming and receiving state */
    status = sd_card_state_get(&cardstate);
    while((SD_OK == status) && ((SD_CARDSTATE_PROGRAMMING == cardstate) || (SD_CARDSTATE_RECEIVING == cardstate))){
        status = sd_card_state_get(&cardstate);
    }
    return status;
}

/*!
    \brief      erase a continuous area of a card
    \param[in]  startaddr: the start address
    \param[in]  endaddr: the end address
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_erase(uint32_t startaddr, uint32_t endaddr)
{
    /* initialize the variables */
    sd_error_enum status = SD_OK;
    uint32_t count = 0, clkdiv = 0;
    __IO uint32_t delay = 0;
    uint8_t cardstate = 0, tempbyte = 0;
    uint16_t tempccc = 0;
    
    /* get the card command classes from CSD */
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_24_31BITS) >> 24);
    tempccc = (uint16_t)((uint16_t)tempbyte << 4);
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_16_23BITS) >> 16);
    tempccc |= (uint16_t)((uint16_t)(tempbyte & 0xF0) >> 4);
    if(0 == (tempccc & SD_CCC_ERASE)){
        /* don't support the erase command */
        status = SD_FUNCTION_UNSUPPORTED;
        return status;
    }
    clkdiv = (SDIO_CLKCTL & SDIO_CLKCTL_DIV);
    clkdiv += ((SDIO_CLKCTL & SDIO_CLKCTL_DIV8)>>31)*256;
    clkdiv += 2;
    delay = 168000 / clkdiv;
    
    /* check whether the card is locked */
    if (sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED)
    {
        status = SD_LOCK_UNLOCK_FAILED;
        return(status);
    }
    
    /* blocksize is fixed in 512B for SDHC card */
    if (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)
    {
        startaddr /= 512;
        endaddr /= 512;
    }
    
    if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype) || 
        (SDIO_HIGH_CAPACITY_SD_CARD == cardtype)){
        /* send CMD32(ERASE_WR_BLK_START) to set the address of the first write block to be erased */
        sdio_command_response_config(SD_CMD_ERASE_WR_BLK_START, startaddr, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_ERASE_WR_BLK_START);
        if(SD_OK != status){
            return status;
        }
        
        /* send CMD33(ERASE_WR_BLK_END) to set the address of the last write block of the continuous range to be erased */
        sdio_command_response_config(SD_CMD_ERASE_WR_BLK_END, endaddr, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_ERASE_WR_BLK_END);
        if(SD_OK != status){
            return status;
        }
    }
    
    /* send CMD38(ERASE) to set the address of the first write block to be erased */
    sdio_command_response_config(SD_CMD_ERASE, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_ERASE);
    if(SD_OK != status){
        return status;
    }
    /* loop until the counter is reach to the calculated time */
    for(count = 0; count < delay; count++){
    }
    /* get the card state and wait the card is out of programming and receiving state */
    status = sd_card_state_get(&cardstate);
    while((SD_OK == status) && ((SD_CARDSTATE_PROGRAMMING == cardstate) || (SD_CARDSTATE_RECEIVING == cardstate))){
        status = sd_card_state_get(&cardstate);
    }
    return status;
}

/*!
    \brief      process all the interrupts which the corresponding flags are set
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_interrupts_process(void)
{
    transerror = SD_OK;
    if(RESET != sdio_interrupt_flag_get(SDIO_INT_FLAG_DTEND)){
        /* send CMD12 to stop data transfer in multipule blocks operation */
        if(1 == stopcondition){
            transerror = sd_transfer_stop();
        }else{
            transerror = SD_OK;
        }
        sdio_interrupt_flag_clear(SDIO_INT_DTEND);
        /* disable all the interrupts */
        sdio_interrupt_disable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_DTEND | SDIO_INT_STBITE | 
                                SDIO_INT_TFH | SDIO_INT_RFH | SDIO_INT_TXURE | SDIO_INT_RXORE);
        transend = 1;
        number_bytes = 0;
        return transerror;
    }
    
    if(RESET != sdio_interrupt_flag_get(SDIO_INT_FLAG_DTCRCERR)){
        sdio_interrupt_flag_clear(SDIO_INT_DTCRCERR);
        /* disable all the interrupts */
        sdio_interrupt_disable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_DTEND | SDIO_INT_STBITE | 
                                SDIO_INT_TFH | SDIO_INT_RFH | SDIO_INT_TXURE | SDIO_INT_RXORE);
        number_bytes = 0;
        transerror = SD_DATA_CRC_ERROR;
        return transerror;
    }
    
    if(RESET != sdio_interrupt_flag_get(SDIO_INT_FLAG_DTTMOUT)){
        sdio_interrupt_flag_clear(SDIO_INT_DTTMOUT);
        /* disable all the interrupts */
        sdio_interrupt_disable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_DTEND | SDIO_INT_STBITE | 
                                SDIO_INT_TFH | SDIO_INT_RFH | SDIO_INT_TXURE | SDIO_INT_RXORE);
        number_bytes = 0;
        transerror = SD_DATA_TIMEOUT;
        return transerror;
    }
    
    if(RESET != sdio_interrupt_flag_get(SDIO_INT_FLAG_STBITE)){
        sdio_interrupt_flag_clear(SDIO_INT_STBITE);
        /* disable all the interrupts */
        sdio_interrupt_disable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_DTEND | SDIO_INT_STBITE | 
                                SDIO_INT_TFH | SDIO_INT_RFH | SDIO_INT_TXURE | SDIO_INT_RXORE);
        number_bytes = 0;
        transerror = SD_START_BIT_ERROR;
        return transerror;
    }
    
    if(RESET != sdio_interrupt_flag_get(SDIO_INT_FLAG_TXURE)){
        sdio_interrupt_flag_clear(SDIO_INT_TXURE);
        /* disable all the interrupts */
        sdio_interrupt_disable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_DTEND | SDIO_INT_STBITE | 
                                SDIO_INT_TFH | SDIO_INT_RFH | SDIO_INT_TXURE | SDIO_INT_RXORE);
        number_bytes = 0;
        transerror = SD_TX_UNDERRUN_ERROR;
        return transerror;
    }
    
    if(RESET != sdio_interrupt_flag_get(SDIO_INT_FLAG_RXORE)){
        sdio_interrupt_flag_clear(SDIO_INT_RXORE);
        /* disable all the interrupts */
        sdio_interrupt_disable(SDIO_INT_DTCRCERR | SDIO_INT_DTTMOUT | SDIO_INT_DTEND | SDIO_INT_STBITE | 
                                SDIO_INT_TFH | SDIO_INT_RFH | SDIO_INT_TXURE | SDIO_INT_RXORE);
        number_bytes = 0;
        transerror = SD_RX_OVERRUN_ERROR;
        return transerror;
    }
    return transerror;
}

/*!
    \brief      select or deselect a card
    \param[in]  cardrca: the RCA of a card
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_card_select_deselect(uint16_t cardrca)
{
    sd_error_enum status = SD_OK;
    /* send CMD7(SELECT/DESELECT_CARD) to select or deselect the card */
    sdio_command_response_config(SD_CMD_SELECT_DESELECT_CARD, (uint32_t)(cardrca << SD_RCA_SHIFT), SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    
    status = r1_error_check(SD_CMD_SELECT_DESELECT_CARD);
    return status;
}

/*!
    \brief      get the card status
    \param[in]  none
    \param[out] pcardstatus: a pointer that store card status
    \retval     sd_error_enum
*/
sd_error_enum sd_cardstatus_get(uint32_t *pcardstatus)
{
    sd_error_enum status = SD_OK;
    if(NULL == pcardstatus){
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    /* send CMD13(SEND_STATUS), addressed card sends its status register */
    sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SEND_STATUS);
    if(SD_OK != status){
        return status;
    }
    
    *pcardstatus = sdio_response_get(SDIO_RESPONSE0);
    return status;
}

/*!
    \brief      get the SD card status
    \param[in]  none
    \param[out] psdstatus: a pointer that store SD card status
    \retval     sd_error_enum
*/
sd_error_enum sd_sdstatus_get(uint32_t *psdstatus)
{
    sd_error_enum status = SD_OK;
    uint32_t count = 0;
    
    /* check whether the card is locked */
    if (sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED)
    {
        status = SD_LOCK_UNLOCK_FAILED;
        return(status);
    }
    
    /* send CMD16(SET_BLOCKLEN) to set the block length */
    sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)64, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SET_BLOCKLEN);
    if(SD_OK != status){
        return status;
    }
    
    /* send CMD55(APP_CMD) to indicate next command is application specific command */
    sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_APP_CMD);
    if(SD_OK != status){
        return status;
    }
    
    /* configure the SDIO data transmisson */
    sdio_data_config(SD_DATATIMEOUT, (uint32_t)64, SDIO_DATABLOCKSIZE_64BYTES);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOSDIO, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_enable();
    
    /* send ACMD13(SD_STATUS) to get the SD status */
    sdio_command_response_config(SD_APPCMD_SD_STATUS, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_APPCMD_SD_STATUS);
    if(SD_OK != status){
        return status;
    }
    
    while(!sdio_flag_get(SDIO_FLAG_DTCRCERR | SDIO_FLAG_DTTMOUT | SDIO_FLAG_RXORE | SDIO_FLAG_DTBLKEND | SDIO_FLAG_STBITE)){
        if(RESET != sdio_flag_get(SDIO_FLAG_RFH)){
            for(count = 0; count < SD_FIFOHALF_WORDS; count++){
                *(psdstatus + count) = sdio_data_read();
            }
            psdstatus += SD_FIFOHALF_WORDS;
        }
    }
    
    /* whether some error occurs and return it */
    if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
        status = SD_DATA_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_DTCRCERR);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
        status = SD_DATA_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_DTTMOUT);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_RXORE)){
        status = SD_RX_OVERRUN_ERROR;
        sdio_flag_clear(SDIO_FLAG_RXORE);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
        status = SD_START_BIT_ERROR;
        sdio_flag_clear(SDIO_FLAG_STBITE);
        return status;
    }
    while(RESET != sdio_flag_get(SDIO_FLAG_RXDTVAL)){
        *psdstatus = sdio_data_read();
        ++psdstatus;
    }
    
    /* clear the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    psdstatus -= 16;
    for(count = 0; count < 16; count++){
        psdstatus[count] = ((psdstatus[count] & SD_MASK_0_7BITS) << 24) |((psdstatus[count] & SD_MASK_8_15BITS) << 8) | 
                           ((psdstatus[count] & SD_MASK_16_23BITS) >> 8) |((psdstatus[count] & SD_MASK_24_31BITS) >> 24);
    }
    return status;
}

/*!
    \brief      stop an ongoing data transfer
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_transfer_stop(void)
{
    sd_error_enum status = SD_OK;
    /* send CMD12(STOP_TRANSMISSION) to stop transmission */
    sdio_command_response_config(SD_CMD_STOP_TRANSMISSION, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_STOP_TRANSMISSION);
    return status;
}

/*!
    \brief      lock or unlock a card
    \param[in]  lockstate: the lock state
      \arg        SD_LOCK: lock the SD card
      \arg        SD_UNLOCK: unlock the SD card
    \param[out] none
    \retval     sd_error_enum
*/
sd_error_enum sd_lock_unlock(uint8_t lockstate)
{
    sd_error_enum status = SD_OK;
    uint8_t cardstate = 0, tempbyte = 0;
    uint32_t pwd1 = 0, pwd2 = 0, response = 0, timeout = 0;
    uint16_t tempccc = 0;
    
    /* get the card command classes from CSD */
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_24_31BITS) >> 24);
    tempccc = (uint16_t)((uint16_t)tempbyte << 4);
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_16_23BITS) >> 16);
    tempccc |= (uint16_t)((uint16_t)(tempbyte & 0xF0) >> 4);
    
    if(0 == (tempccc & SD_CCC_LOCK_CARD)){
        /* don't support the lock command */
        status = SD_FUNCTION_UNSUPPORTED;
        return status;
    }
    /* password pattern */
    pwd1 = (0x01020600|lockstate);
    pwd2 = 0x03040506;
    
     /* clear all DSM configuration */
    sdio_data_config(0, 0, SDIO_DATABLOCKSIZE_1BYTE);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_disable();
    sdio_dma_disable();
    
    /* send CMD16(SET_BLOCKLEN) to set the block length */
    sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)8, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SET_BLOCKLEN);
    if(SD_OK != status){
        return status;
    }
    
    /* send CMD13(SEND_STATUS), addressed card sends its status register */
    sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SEND_STATUS);
    if(SD_OK != status){
        return status;
    }
    
    response = sdio_response_get(SDIO_RESPONSE0);
    timeout = 10000;
    while((0 == (response & SD_R1_READY_FOR_DATA)) && (timeout > 0)){
        /* continue to send CMD13 to polling the state of card until buffer empty or timeout */
        --timeout;
        /* send CMD13(SEND_STATUS), addressed card sends its status registers */
        sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
        sdio_wait_type_set(SDIO_WAITTYPE_NO);
        sdio_csm_enable();
        /* check if some error occurs */
        status = r1_error_check(SD_CMD_SEND_STATUS);
        if(SD_OK != status){
            return status;
        }
        response = sdio_response_get(SDIO_RESPONSE0);
    }
    if(0 == timeout){
        return SD_ERROR;
    }
    
    /* send CMD42(LOCK_UNLOCK) to set/reset the password or lock/unlock the card */
    sdio_command_response_config(SD_CMD_LOCK_UNLOCK, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_LOCK_UNLOCK);
    if(SD_OK != status){
        return status;
    }
    
    response = sdio_response_get(SDIO_RESPONSE0);
    
    /* configure the SDIO data transmisson */
    sdio_data_config(SD_DATATIMEOUT, (uint32_t)8, SDIO_DATABLOCKSIZE_8BYTES);
    sdio_data_transfer_config(SDIO_TRANSDIRECTION_TOCARD, SDIO_TRANSMODE_BLOCK);
    sdio_dsm_enable();
    
    /* write password pattern */
    sdio_data_write(pwd1);
    sdio_data_write(pwd2);
    
    /* whether some error occurs and return it */
    if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
        status = SD_DATA_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_DTCRCERR);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
        status = SD_DATA_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_DTTMOUT);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_TXURE)){
        status = SD_TX_UNDERRUN_ERROR;
        sdio_flag_clear(SDIO_FLAG_TXURE);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
        status = SD_START_BIT_ERROR;
        sdio_flag_clear(SDIO_FLAG_STBITE);
        return status;
    }
    
    /* clear the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* get the card state and wait the card is out of programming and receiving state */
    status = sd_card_state_get(&cardstate);
    while((SD_OK == status) && ((SD_CARDSTATE_PROGRAMMING == cardstate) || (SD_CARDSTATE_RECEIVING == cardstate))){
        status = sd_card_state_get(&cardstate);
    }
    return status;
}

/*!
    \brief      get the data transfer state
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
sd_transfer_state_enum sd_transfer_state_get(void)
{
    sd_transfer_state_enum transtate = SD_NO_TRANSFER;
    if(RESET != sdio_flag_get(SDIO_FLAG_TXRUN | SDIO_FLAG_RXRUN)){
        transtate = SD_TRANSFER_IN_PROGRESS;
    }
    return transtate;
}

/*!
    \brief      get SD card capacity
    \param[in]  none
    \param[out] none
    \retval     capacity of the card(KB)
*/
uint32_t sd_card_capacity_get(void)
{
    uint8_t tempbyte = 0, devicesize_mult = 0, readblklen = 0;
    uint32_t capacity = 0, devicesize = 0;
    if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype)){
        /* calculate the c_size(device size) */
        tempbyte = (uint8_t)(sd_csd[1] & SD_MASK_0_7BITS);
        devicesize |= (uint32_t)((uint32_t)tempbyte << 2);
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_24_31BITS) >> 24);
        devicesize |= (uint32_t)((uint32_t)(tempbyte & 0xC0) >> 6);
        
        /* calculate the c_size_mult(device size multiplier) */
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_16_23BITS) >> 16);
        devicesize_mult = (tempbyte & 0x03) << 1;
        
        /* calculate the read_bl_len */
        tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_16_23BITS) >> 16);
        readblklen = tempbyte & 0x0F;
        
        /* capacity = BLOCKNR*BLOCK_LEN, BLOCKNR = (C_SIZE+1)*MULT, MULT = 2^(C_SIZE_MULT+2), BLOCK_LEN = 2^READ_BL_LEN */
        capacity = (devicesize + 1)*(1 << (devicesize_mult + 2));
        capacity *= (1 << readblklen);
    }else if(SDIO_HIGH_CAPACITY_SD_CARD == cardtype){
        /* calculate the c_size */
        tempbyte = (uint8_t)(sd_csd[1] & SD_MASK_0_7BITS);
        devicesize = (uint32_t)((uint32_t)(tempbyte & 0x3F) << 16);
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_24_31BITS) >> 24);
        devicesize |= (uint32_t)((uint32_t)tempbyte << 8);
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_16_23BITS) >> 16);
        devicesize |= (uint32_t)tempbyte;
        
        /* capacity = (c_size+1)*512KByte */
        capacity = (devicesize + 1)*512;
    }
    return capacity;
}

/*!
    \brief      get the detailed information of the SD card based on received CID and CSD
    \param[in]  none
    \param[out] pcardinfo: a pointer that store the detailed card information
    \retval     sd_error_enum
*/
sd_error_enum sd_card_information_get(sd_card_info_struct *pcardinfo)
{
    sd_error_enum status = SD_OK;
    uint8_t tempbyte = 0;
    
    if(NULL == pcardinfo){
        status = SD_PARAMETER_INVALID;
        return status;
    }
    
    /* store the card type and RCA */
    pcardinfo->card_type = cardtype;
    pcardinfo->card_rca = sd_rca;
    
    /* CID byte 0 */
    tempbyte = (uint8_t)((sd_cid[0] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_cid.mid = tempbyte;
    
    /* CID byte 1 */
    tempbyte = (uint8_t)((sd_cid[0] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_cid.oid = (uint16_t)((uint16_t)tempbyte << 8);
    
    /* CID byte 2 */
    tempbyte = (uint8_t)((sd_cid[0] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_cid.oid |= (uint16_t)tempbyte;
    
    /* CID byte 3 */
    tempbyte = (uint8_t)(sd_cid[0] & SD_MASK_0_7BITS);
    pcardinfo->card_cid.pnm0 = (uint32_t)((uint32_t)tempbyte << 24);
    
    /* CID byte 4 */
    tempbyte = (uint8_t)((sd_cid[1] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_cid.pnm0 |= (uint32_t)((uint32_t)tempbyte << 16);
    
    /* CID byte 5 */
    tempbyte = (uint8_t)((sd_cid[1] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_cid.pnm0 |= (uint32_t)((uint32_t)tempbyte << 8);
    
    /* CID byte 6 */
    tempbyte = (uint8_t)((sd_cid[1] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_cid.pnm0 |= (uint32_t)(tempbyte);
    
    /* CID byte 7 */
    tempbyte = (uint8_t)(sd_cid[1] & SD_MASK_0_7BITS);
    pcardinfo->card_cid.pnm1 = tempbyte;
    
    /* CID byte 8 */
    tempbyte = (uint8_t)((sd_cid[2] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_cid.prv = tempbyte;
    
    /* CID byte 9 */
    tempbyte = (uint8_t)((sd_cid[2] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_cid.psn = (uint32_t)((uint32_t)tempbyte << 24);
    
    /* CID byte 10 */
    tempbyte = (uint8_t)((sd_cid[2] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_cid.psn |= (uint32_t)((uint32_t)tempbyte << 16);
    
    /* CID byte 11 */
    tempbyte = (uint8_t)(sd_cid[2] & SD_MASK_0_7BITS);
    pcardinfo->card_cid.psn |= (uint32_t)tempbyte;
    
    /* CID byte 12 */
    tempbyte = (uint8_t)((sd_cid[3] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_cid.psn |= (uint32_t)tempbyte;
    
    /* CID byte 13 */
    tempbyte = (uint8_t)((sd_cid[3] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_cid.mdt = (uint16_t)((uint16_t)(tempbyte & 0x0F) << 8);
    
    /* CID byte 14 */
    tempbyte = (uint8_t)((sd_cid[3] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_cid.mdt |= (uint16_t)tempbyte;
    
    /* CID byte 15 */
    tempbyte = (uint8_t)(sd_cid[3] & SD_MASK_0_7BITS);
    pcardinfo->card_cid.cid_crc = (tempbyte & 0xFE) >> 1;
    
    /* CSD byte 0 */
    tempbyte = (uint8_t)((sd_csd[0] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_csd.csd_struct = (tempbyte & 0xC0) >> 6;
    
    /* CSD byte 1 */
    tempbyte = (uint8_t)((sd_csd[0] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_csd.taac = tempbyte;
    
    /* CSD byte 2 */
    tempbyte = (uint8_t)((sd_csd[0] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_csd.nsac = tempbyte;
    
    /* CSD byte 3 */
    tempbyte = (uint8_t)(sd_csd[0] & SD_MASK_0_7BITS);
    pcardinfo->card_csd.tran_speed = tempbyte;
    
    /* CSD byte 4 */
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_csd.ccc = (uint16_t)((uint16_t)tempbyte << 4);
    
    /* CSD byte 5 */
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_csd.ccc |= (uint16_t)((uint16_t)(tempbyte & 0xF0) >> 4);
    pcardinfo->card_csd.read_bl_len = tempbyte & 0x0F;
    
    /* CSD byte 6 */
    tempbyte = (uint8_t)((sd_csd[1] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_csd.read_bl_partial = (tempbyte & 0x80) >> 7;
    pcardinfo->card_csd.write_blk_misalign = (tempbyte & 0x40) >> 6;
    pcardinfo->card_csd.read_blk_misalign = (tempbyte & 0x20) >> 5;
    pcardinfo->card_csd.dsp_imp = (tempbyte & 0x10) >> 4;
    
    if((SDIO_STD_CAPACITY_SD_CARD_V1_1 == cardtype) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == cardtype)){
        /* card is SDSC card, CSD version 1.0 */
        pcardinfo->card_csd.c_size = (uint32_t)((uint32_t)(tempbyte & 0x03) << 10);
        
        /* CSD byte 7 */
        tempbyte = (uint8_t)(sd_csd[1] & SD_MASK_0_7BITS);
        pcardinfo->card_csd.c_size |= (uint32_t)((uint32_t)tempbyte << 2);
        
        /* CSD byte 8 */
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_24_31BITS) >> 24);
        pcardinfo->card_csd.c_size |= (uint32_t)((uint32_t)(tempbyte & 0xC0) >> 6);
        pcardinfo->card_csd.vdd_r_curr_min = (tempbyte & 0x38) >> 3;
        pcardinfo->card_csd.vdd_r_curr_max = tempbyte & 0x07;
        
        /* CSD byte 9 */
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_16_23BITS) >> 16);
        pcardinfo->card_csd.vdd_w_curr_min = (tempbyte & 0xE0) >> 5;
        pcardinfo->card_csd.vdd_w_curr_max = (tempbyte & 0x1C) >> 2;
        pcardinfo->card_csd.c_size_mult = (tempbyte & 0x03) << 1;
        
        /* CSD byte 10 */
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_8_15BITS) >> 8);
        pcardinfo->card_csd.c_size_mult |= (tempbyte & 0x80) >> 7;
        
        /* calculate the card block size and capacity */
        pcardinfo->card_blocksize = 1 << (pcardinfo->card_csd.read_bl_len);
        pcardinfo->card_capacity = pcardinfo->card_csd.c_size + 1;
        pcardinfo->card_capacity *= (1 << (pcardinfo->card_csd.c_size_mult + 2));
        pcardinfo->card_capacity *= pcardinfo->card_blocksize;
    }else if(SDIO_HIGH_CAPACITY_SD_CARD == cardtype){
        /* card is SDHC card, CSD version 2.0 */
        /* CSD byte 7 */
        tempbyte = (uint8_t)(sd_csd[1] & SD_MASK_0_7BITS);
        pcardinfo->card_csd.c_size = (uint32_t)((uint32_t)(tempbyte & 0x3F) << 16);
        
        /* CSD byte 8 */
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_24_31BITS) >> 24);
        pcardinfo->card_csd.c_size |= (uint32_t)((uint32_t)tempbyte << 8);
        
        /* CSD byte 9 */
        tempbyte = (uint8_t)((sd_csd[2] & SD_MASK_16_23BITS) >> 16);
        pcardinfo->card_csd.c_size |= (uint32_t)tempbyte;
        
        /* calculate the card block size and capacity */
        pcardinfo->card_blocksize = 512;
        pcardinfo->card_capacity = (pcardinfo->card_csd.c_size + 1) * 512 *1024;
    }
    
    pcardinfo->card_csd.erase_blk_en = (tempbyte & 0x40) >> 6;
    pcardinfo->card_csd.sector_size = (tempbyte & 0x3F) << 1;
    
    /* CSD byte 11 */
    tempbyte = (uint8_t)(sd_csd[2] & SD_MASK_0_7BITS);
    pcardinfo->card_csd.sector_size |= (tempbyte & 0x80) >> 7;
    pcardinfo->card_csd.wp_grp_size = (tempbyte & 0x7F);
    
    /* CSD byte 12 */
    tempbyte = (uint8_t)((sd_csd[3] & SD_MASK_24_31BITS) >> 24);
    pcardinfo->card_csd.wp_grp_enable = (tempbyte & 0x80) >> 7;
    pcardinfo->card_csd.r2w_factor = (tempbyte & 0x1C) >> 2;
    pcardinfo->card_csd.write_bl_len = (tempbyte & 0x03) << 2;
    
    /* CSD byte 13 */
    tempbyte = (uint8_t)((sd_csd[3] & SD_MASK_16_23BITS) >> 16);
    pcardinfo->card_csd.write_bl_len |= (tempbyte & 0xC0) >> 6;
    pcardinfo->card_csd.write_bl_partial = (tempbyte & 0x20) >> 5;
    
    /* CSD byte 14 */
    tempbyte = (uint8_t)((sd_csd[3] & SD_MASK_8_15BITS) >> 8);
    pcardinfo->card_csd.file_format_grp = (tempbyte & 0x80) >> 7;
    pcardinfo->card_csd.copy_flag = (tempbyte & 0x40) >> 6;
    pcardinfo->card_csd.perm_write_protect = (tempbyte & 0x20) >> 5;
    pcardinfo->card_csd.tmp_write_protect = (tempbyte & 0x10) >> 4;
    pcardinfo->card_csd.file_format = (tempbyte & 0x0C) >> 2;
    
    /* CSD byte 15 */
    tempbyte = (uint8_t)(sd_csd[3] & SD_MASK_0_7BITS);
    pcardinfo->card_csd.csd_crc = (tempbyte & 0xFE) >> 1;
    
    return status;
}

/*!
    \brief      check if the command sent error occurs
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum cmdsent_error_check(void)
{
    sd_error_enum status = SD_OK;
    uint32_t timeout = 10000;
    /* check command sent flag */
    while((RESET == sdio_flag_get(SDIO_FLAG_CMDSEND)) && (timeout > 0)){
        --timeout;
    }
    /* command response is timeout */
    if(0 == timeout){
        status = SD_CMD_RESP_TIMEOUT;
        return status;
    }
    /* if the command is sent, clear the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    return status;
}

/*!
    \brief      check if error type for R1 response
    \param[in]  resp: content of response
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum r1_error_type_check(uint32_t resp)
{
    sd_error_enum status = SD_ERROR;
    /* check which error occurs */
    if(resp & SD_R1_OUT_OF_RANGE){
        status = SD_OUT_OF_RANGE;
    }else if(resp & SD_R1_ADDRESS_ERROR){
        status = SD_ADDRESS_ERROR;
    }else if(resp & SD_R1_BLOCK_LEN_ERROR){
        status = SD_BLOCK_LEN_ERROR;
    }else if(resp & SD_R1_ERASE_SEQ_ERROR){
        status = SD_ERASE_SEQ_ERROR;
    }else if(resp & SD_R1_ERASE_PARAM){
        status = SD_ERASE_PARAM;
    }else if(resp & SD_R1_WP_VIOLATION){
        status = SD_WP_VIOLATION;
    }else if(resp & SD_R1_LOCK_UNLOCK_FAILED){
        status = SD_LOCK_UNLOCK_FAILED;
    }else if(resp & SD_R1_COM_CRC_ERROR){
        status = SD_COM_CRC_ERROR;
    }else if(resp & SD_R1_ILLEGAL_COMMAND){
        status = SD_ILLEGAL_COMMAND;
    }else if(resp & SD_R1_CARD_ECC_FAILED){
        status = SD_CARD_ECC_FAILED;
    }else if(resp & SD_R1_CC_ERROR){
        status = SD_CC_ERROR;
    }else if(resp & SD_R1_GENERAL_UNKNOWN_ERROR){
        status = SD_GENERAL_UNKNOWN_ERROR;
    }else if(resp & SD_R1_CSD_OVERWRITE){
        status = SD_CSD_OVERWRITE;
    }else if(resp & SD_R1_WP_ERASE_SKIP){
        status = SD_WP_ERASE_SKIP;
    }else if(resp & SD_R1_CARD_ECC_DISABLED){
        status = SD_CARD_ECC_DISABLED;
    }else if(resp & SD_R1_ERASE_RESET){
        status = SD_ERASE_RESET;
    }else if(resp & SD_R1_AKE_SEQ_ERROR){
        status = SD_AKE_SEQ_ERROR;
    }
    return status;
}

/*!
    \brief      check if error occurs for R1 response
    \param[in]  cmdindex: the index of command
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum r1_error_check(uint8_t cmdindex)
{
    sd_error_enum status = SD_OK;
    uint32_t reg_status = 0, resp_r1 = 0;
    
    /* store the content of SDIO_STAT */
    reg_status = SDIO_STAT;
    while(!(reg_status & (SDIO_FLAG_CCRCERR | SDIO_FLAG_CMDTMOUT | SDIO_FLAG_CMDRECV))){
        reg_status = SDIO_STAT;
    }
    /* check whether an error or timeout occurs or command response received */
    if(reg_status & SDIO_FLAG_CCRCERR){
        status = SD_CMD_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_CCRCERR);
        return status;
    }else if(reg_status & SDIO_FLAG_CMDTMOUT){
        status = SD_CMD_RESP_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_CMDTMOUT);
        return status;
    }
    
    /* check whether the last response command index is the desired one */
    if(sdio_command_index_get() != cmdindex){
        status = SD_ILLEGAL_COMMAND;
        return status;
    }
    /* clear all the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* get the SDIO response register 0 for checking */
    resp_r1 = sdio_response_get(SDIO_RESPONSE0);
    if(SD_ALLZERO == (resp_r1 & SD_R1_ERROR_BITS)){
        /* no error occurs, return SD_OK */
        status = SD_OK;
        return status;
    }
    
    /* if some error occurs, return the error type */
    status = r1_error_type_check(resp_r1);
    return status;
}

/*!
    \brief      check if error occurs for R2 response
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum r2_error_check(void)
{
    sd_error_enum status = SD_OK;
    uint32_t reg_status = 0;
    
    /* store the content of SDIO_STAT */
    reg_status = SDIO_STAT;
    while(!(reg_status & (SDIO_FLAG_CCRCERR | SDIO_FLAG_CMDTMOUT | SDIO_FLAG_CMDRECV))){
        reg_status = SDIO_STAT;
    }
    /* check whether an error or timeout occurs or command response received */
    if(reg_status & SDIO_FLAG_CCRCERR){
        status = SD_CMD_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_CCRCERR);
        return status;
    }else if(reg_status & SDIO_FLAG_CMDTMOUT){
        status = SD_CMD_RESP_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_CMDTMOUT);
        return status;
    }
    /* clear all the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    return status;
}

/*!
    \brief      check if error occurs for R3 response
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum r3_error_check(void)
{
    sd_error_enum status = SD_OK;
    uint32_t reg_status = 0;
    
    /* store the content of SDIO_STAT */
    reg_status = SDIO_STAT;
    while(!(reg_status & (SDIO_FLAG_CCRCERR | SDIO_FLAG_CMDTMOUT | SDIO_FLAG_CMDRECV))){
        reg_status = SDIO_STAT;
    }
    if(reg_status & SDIO_FLAG_CMDTMOUT){
        status = SD_CMD_RESP_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_CMDTMOUT);
        return status;
    }
    /* clear all the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    return status;
}

/*!
    \brief      check if error occurs for R6 response
    \param[in]  cmdindex: the index of command
    \param[out] prca: a pointer that store the RCA of card
    \retval     sd_error_enum
*/
static sd_error_enum r6_error_check(uint8_t cmdindex, uint16_t *prca)
{
    sd_error_enum status = SD_OK;
    uint32_t reg_status = 0, response = 0;
    
    /* store the content of SDIO_STAT */
    reg_status = SDIO_STAT;
    while(!(reg_status & (SDIO_FLAG_CCRCERR | SDIO_FLAG_CMDTMOUT | SDIO_FLAG_CMDRECV))){
        reg_status = SDIO_STAT;
    }
    /* check whether an error or timeout occurs or command response received */
    if(reg_status & SDIO_FLAG_CCRCERR){
        status = SD_CMD_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_CCRCERR);
        return status;
    }else if(reg_status & SDIO_FLAG_CMDTMOUT){
        status = SD_CMD_RESP_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_CMDTMOUT);
        return status;
    }
    
    /* check whether the last response command index is the desired one */
    if(sdio_command_index_get() != cmdindex){
        status = SD_ILLEGAL_COMMAND;
        return status;
    }
    /* clear all the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* get the SDIO response register 0 for checking */
    response = sdio_response_get(SDIO_RESPONSE0);
    
    if(SD_ALLZERO == (response & (SD_R6_COM_CRC_ERROR | SD_R6_ILLEGAL_COMMAND | SD_R6_GENERAL_UNKNOWN_ERROR))){
        *prca = (uint16_t)(response >> 16);
        return status;
    }
    /* if some error occurs, return the error type */
    if(response & SD_R6_COM_CRC_ERROR){
        status = SD_COM_CRC_ERROR;
    }else if(response & SD_R6_ILLEGAL_COMMAND){
        status = SD_ILLEGAL_COMMAND;
    }else if(response & SD_R6_GENERAL_UNKNOWN_ERROR){
        status = SD_GENERAL_UNKNOWN_ERROR;
    }
    return status;
}

/*!
    \brief      check if error occurs for R7 response
    \param[in]  none
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum r7_error_check(void)
{
    sd_error_enum status = SD_ERROR;
    uint32_t reg_status = 0, timeout = 10000;
    
    /* store the content of SDIO_STAT */
    reg_status = SDIO_STAT;
    while(!(reg_status & (SDIO_FLAG_CCRCERR | SDIO_FLAG_CMDTMOUT | SDIO_FLAG_CMDRECV)) && (timeout > 0)){
        reg_status = SDIO_STAT;
        --timeout;
    }
    
    /* check the flags */
    if((reg_status & SDIO_FLAG_CMDTMOUT) || (0 == timeout)){
        status = SD_CMD_RESP_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_CMDTMOUT);
        return status;
    }
    if(reg_status & SDIO_FLAG_CMDRECV){
        status = SD_OK;
        sdio_flag_clear(SDIO_FLAG_CMDRECV);
        return status;
    }
    return status;
}

/*!
    \brief      get the state which the card is in
    \param[in]  none
    \param[out] pcardstate: a pointer that store the card state
      \arg        SD_CARDSTATE_IDLE: card is in idle state
      \arg        SD_CARDSTATE_READY: card is in ready state
      \arg        SD_CARDSTATE_IDENTIFICAT: card is in identificat state
      \arg        SD_CARDSTATE_STANDBY: card is in standby state
      \arg        SD_CARDSTATE_TRANSFER: card is in transfer state
      \arg        SD_CARDSTATE_DATA: card is in data state
      \arg        SD_CARDSTATE_RECEIVING: card is in receiving state
      \arg        SD_CARDSTATE_PROGRAMMING: card is in programming state
      \arg        SD_CARDSTATE_DISCONNECT: card is in disconnect state
      \arg        SD_CARDSTATE_LOCKED: card is in locked state
    \retval     sd_error_enum
*/
static sd_error_enum sd_card_state_get(uint8_t *pcardstate)
{
    sd_error_enum status = SD_OK;
    __IO uint32_t reg_status = 0, response = 0;
    
    /* send CMD13(SEND_STATUS), addressed card sends its status register */
    sdio_command_response_config(SD_CMD_SEND_STATUS, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    
    /* store the content of SDIO_STAT */
    reg_status = SDIO_STAT;
    while(!(reg_status & (SDIO_FLAG_CCRCERR | SDIO_FLAG_CMDTMOUT | SDIO_FLAG_CMDRECV))){
        reg_status = SDIO_STAT;
    }
    /* check whether an error or timeout occurs or command response received */
    if(reg_status & SDIO_FLAG_CCRCERR){
        status = SD_CMD_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_CCRCERR);
        return status;
    }else if(reg_status & SDIO_FLAG_CMDTMOUT){
        status = SD_CMD_RESP_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_CMDTMOUT);
        return status;
    }
    
    /* command response received, store the response command index */
    reg_status = (uint32_t)sdio_command_index_get();
    if(reg_status != (uint32_t)SD_CMD_SEND_STATUS){
        status = SD_ILLEGAL_COMMAND;
        return status;
    }
    /* clear all the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* get the SDIO response register 0 for checking */
    response = sdio_response_get(SDIO_RESPONSE0);
    *pcardstate = (uint8_t)((response >> 9) & 0x0000000F);
    
    if(SD_ALLZERO == (response & SD_R1_ERROR_BITS)){
        /* no error occurs, return SD_OK */
        status = SD_OK;
        return status;
    }
    
    /* if some error occurs, return the error type */
    status = r1_error_type_check(response);
    return status;
}

/*!
    \brief      configure the bus width mode
    \param[in]  buswidth: the bus width
      \arg        SD_BUS_WIDTH_1BIT: 1-bit bus width
      \arg        SD_BUS_WIDTH_4BIT: 4-bit bus width
    \param[out] none
    \retval     sd_error_enum
*/
static sd_error_enum sd_bus_width_config(uint32_t buswidth)
{
    sd_error_enum status = SD_OK;
    /* check whether the card is locked */
    if(sdio_response_get(SDIO_RESPONSE0) & SD_CARDSTATE_LOCKED){
        status = SD_LOCK_UNLOCK_FAILED;
        return status;
    }
    /* get the SCR register */
    status = sd_scr_get(sd_rca, sd_scr);
    if(SD_OK != status){
        return status;
    }
    
    if(SD_BUS_WIDTH_1BIT == buswidth){
        if(SD_ALLZERO != (sd_scr[1] & buswidth)){
            /* send CMD55(APP_CMD) to indicate next command is application specific command */
            sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_CMD_APP_CMD);
            if(SD_OK != status){
                return status;
            }
            
            /* send ACMD6(SET_BUS_WIDTH) to define the data bus width */
            sdio_command_response_config(SD_APPCMD_SET_BUS_WIDTH, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_APPCMD_SET_BUS_WIDTH);
            if(SD_OK != status){
                return status;
            }
        }else{
            status = SD_OPERATION_IMPROPER;
        }
        return status;
    }else if(SD_BUS_WIDTH_4BIT == buswidth){
        if(SD_ALLZERO != (sd_scr[1] & buswidth)){
            /* send CMD55(APP_CMD) to indicate next command is application specific command */
            sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)sd_rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_CMD_APP_CMD);
            if(SD_OK != status){
                return status;
            }
            
            /* send ACMD6(SET_BUS_WIDTH) to define the data bus width */
            sdio_command_response_config(SD_APPCMD_SET_BUS_WIDTH, (uint32_t)0x2, SDIO_RESPONSETYPE_SHORT);
            sdio_wait_type_set(SDIO_WAITTYPE_NO);
            sdio_csm_enable();
            /* check if some error occurs */
            status = r1_error_check(SD_APPCMD_SET_BUS_WIDTH);
            if(SD_OK != status){
                return status;
            }
        }else{
            status = SD_OPERATION_IMPROPER;
        }
        return status;
    }else{
        status = SD_PARAMETER_INVALID;
        return status;
    }
}

/*!
    \brief      get the SCR of corresponding card
    \param[in]  rca: RCA of a card
    \param[out] pscr: a pointer that store the SCR content
    \retval     sd_error_enum
*/
static sd_error_enum sd_scr_get(uint16_t rca, uint32_t *pscr)
{
    sd_error_enum status = SD_OK;
    uint32_t temp_scr[2] = {0, 0}, idx_scr = 0;
    /* send CMD16(SET_BLOCKLEN) to set block length */
    sdio_command_response_config(SD_CMD_SET_BLOCKLEN, (uint32_t)8, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_SET_BLOCKLEN);
    if(SD_OK != status){
        return status;
    }
    
    /* send CMD55(APP_CMD) to indicate next command is application specific command */
    sdio_command_response_config(SD_CMD_APP_CMD, (uint32_t)rca << SD_RCA_SHIFT, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_CMD_APP_CMD);
    if(SD_OK != status){
        return status;
    }
    
    /* configure SDIO data */
    sdio_data_config(SD_DATATIMEOUT, (uint32_t)8, SDIO_DATABLOCKSIZE_8BYTES);
    sdio_data_transfer_config(SDIO_TRANSMODE_BLOCK, SDIO_TRANSDIRECTION_TOSDIO);
    sdio_dsm_enable();
    
    /* send ACMD51(SEND_SCR) to read the SD configuration register */
    sdio_command_response_config(SD_APPCMD_SEND_SCR, (uint32_t)0x0, SDIO_RESPONSETYPE_SHORT);
    sdio_wait_type_set(SDIO_WAITTYPE_NO);
    sdio_csm_enable();
    /* check if some error occurs */
    status = r1_error_check(SD_APPCMD_SEND_SCR);
    if(SD_OK != status){
        return status;
    }
    
    /* store the received SCR */
    while(!sdio_flag_get(SDIO_FLAG_DTCRCERR | SDIO_FLAG_DTTMOUT | SDIO_FLAG_RXORE | SDIO_FLAG_DTBLKEND | SDIO_FLAG_STBITE)){
        if(RESET != sdio_flag_get(SDIO_FLAG_RXDTVAL)){
            *(temp_scr + idx_scr) = sdio_data_read();
            ++idx_scr;
        }
    }
    
    /* check whether some error occurs */
    if(RESET != sdio_flag_get(SDIO_FLAG_DTCRCERR)){
        status = SD_DATA_CRC_ERROR;
        sdio_flag_clear(SDIO_FLAG_DTCRCERR);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_DTTMOUT)){
        status = SD_DATA_TIMEOUT;
        sdio_flag_clear(SDIO_FLAG_DTTMOUT);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_RXORE)){
        status = SD_RX_OVERRUN_ERROR;
        sdio_flag_clear(SDIO_FLAG_RXORE);
        return status;
    }else if(RESET != sdio_flag_get(SDIO_FLAG_STBITE)){
        status = SD_START_BIT_ERROR;
        sdio_flag_clear(SDIO_FLAG_STBITE);
        return status;
    }
    
    /* clear all the SDIO_INTC flags */
    sdio_flag_clear(SDIO_MASK_INTC_FLAGS);
    /* readjust the temp SCR value */
    *(pscr) = ((temp_scr[1] & SD_MASK_0_7BITS) << 24) | ((temp_scr[1] & SD_MASK_8_15BITS) << 8) | 
                ((temp_scr[1] & SD_MASK_16_23BITS) >> 8) | ((temp_scr[1] & SD_MASK_24_31BITS) >> 24);
    *(pscr + 1) = ((temp_scr[0] & SD_MASK_0_7BITS) << 24) | ((temp_scr[0] & SD_MASK_8_15BITS) << 8) | 
                ((temp_scr[0] & SD_MASK_16_23BITS) >> 8) | ((temp_scr[0] & SD_MASK_24_31BITS) >> 24);
    return status;
}

/*!
    \brief      get the data block size
    \param[in]  bytesnumber: the number of bytes
    \param[out] none
    \retval     data block size
      \arg        SDIO_DATABLOCKSIZE_1BYTE: block size = 1 byte
      \arg        SDIO_DATABLOCKSIZE_2BYTES: block size = 2 bytes
      \arg        SDIO_DATABLOCKSIZE_4BYTES: block size = 4 bytes
      \arg        SDIO_DATABLOCKSIZE_8BYTES: block size = 8 bytes
      \arg        SDIO_DATABLOCKSIZE_16BYTES: block size = 16 bytes
      \arg        SDIO_DATABLOCKSIZE_32BYTES: block size = 32 bytes
      \arg        SDIO_DATABLOCKSIZE_64BYTES: block size = 64 bytes
      \arg        SDIO_DATABLOCKSIZE_128BYTES: block size = 128 bytes
      \arg        SDIO_DATABLOCKSIZE_256BYTES: block size = 256 bytes
      \arg        SDIO_DATABLOCKSIZE_512BYTES: block size = 512 bytes
      \arg        SDIO_DATABLOCKSIZE_1024BYTES: block size = 1024 bytes
      \arg        SDIO_DATABLOCKSIZE_2048BYTES: block size = 2048 bytes
      \arg        SDIO_DATABLOCKSIZE_4096BYTES: block size = 4096 bytes
      \arg        SDIO_DATABLOCKSIZE_8192BYTES: block size = 8192 bytes
      \arg        SDIO_DATABLOCKSIZE_16384BYTES: block size = 16384 bytes
*/
static uint32_t sd_datablocksize_get(uint16_t bytesnumber)
{
    uint8_t exp_val = 0;
    /* calculate the exponent of 2 */
    while(1 != bytesnumber){
        bytesnumber >>= 1;
        ++exp_val;
    }
    return DATACTL_BLKSZ(exp_val);
}

/*!
    \brief      configure the GPIO of SDIO interface
    \param[in]  none
    \param[out] none
    \retval     none
*/
static void gpio_config(void)
{
    /* configure the PB.8, PB.9, PC.6, PC.7, PC.8, PC.9, PC.10, PC.11, PC.12 and PD.2 */
    gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8 | GPIO_PIN_9);
    gpio_init(GPIOC, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_8 | 
                                                         GPIO_PIN_9 | GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12);
    gpio_init(GPIOD, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_2);  
}

/*!
    \brief      configure the RCU of SDIO and DMA
    \param[in]  none
    \param[out] none
    \retval     none
*/
static void rcu_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);
    rcu_periph_clock_enable(RCU_GPIOC);
    rcu_periph_clock_enable(RCU_GPIOD);
    rcu_periph_clock_enable(RCU_AF);
    
    rcu_periph_clock_enable(RCU_SDIO);
    rcu_periph_clock_enable(RCU_DMA1);
}

/*!
    \brief      configure the DMA1 channel 3 for transferring data
    \param[in]  srcbuf: a pointer point to a buffer which will be transferred
    \param[in]  bufsize: the size of buffer(not used in flow controller is peripheral)
    \param[out] none
    \retval     none
*/
static void dma_transfer_config(uint32_t *srcbuf, uint32_t bufsize)
{
    dma_parameter_struct dma_struct;
    /* clear all the interrupt flags */
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_G);
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_FTF);
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_HTF);
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_ERR);
    dma_channel_disable(DMA1, DMA_CH3);
    dma_deinit(DMA1, DMA_CH3);
    
    /* configure the DMA1 channel3 */
    dma_struct.periph_addr = (uint32_t)SDIO_FIFO_ADDR;
    dma_struct.memory_addr = (uint32_t)srcbuf;
    dma_struct.direction = DMA_MEMORY_TO_PERIPHERAL;
    dma_struct.number = bufsize / 4;
    dma_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_struct.periph_width = DMA_PERIPHERAL_WIDTH_32BIT;
    dma_struct.memory_width = DMA_MEMORY_WIDTH_32BIT; 
    dma_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA1, DMA_CH3, dma_struct);
    
    dma_circulation_disable(DMA1, DMA_CH3);
    dma_channel_enable(DMA1, DMA_CH3);
}

/*!
    \brief      configure the DMA1 channel 3 for receiving data
    \param[in]  dstbuf: a pointer point to a buffer which will receive data
    \param[in]  bufsize: the size of buffer(not used in flow controller is peripheral)
    \param[out] none
    \retval     none
*/
static void dma_receive_config(uint32_t *dstbuf, uint32_t bufsize)
{
    dma_parameter_struct dma_struct;
    /* clear all the interrupt flags */
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_G);
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_FTF);
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_HTF);
    dma_flag_clear(DMA1, DMA_CH3, DMA_FLAG_ERR);
    dma_channel_disable(DMA1, DMA_CH3);
    dma_deinit(DMA1, DMA_CH3);
    
    /* configure the DMA1 channel 3 */
    dma_struct.periph_addr = (uint32_t)SDIO_FIFO_ADDR;
    dma_struct.memory_addr = (uint32_t)dstbuf;
    dma_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_struct.number = bufsize / 4;
    dma_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_struct.periph_width = DMA_PERIPHERAL_WIDTH_32BIT;
    dma_struct.memory_width = DMA_MEMORY_WIDTH_32BIT; 
    dma_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA1, DMA_CH3, dma_struct);
    
    dma_circulation_disable(DMA1, DMA_CH3);
    dma_channel_enable(DMA1, DMA_CH3);
}
